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Re: [Xen-devel] [PATCH] x86/hvm: implement save/restore for posted interrupts

> From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
> Sent: Friday, July 25, 2014 2:41 AM
> >>> On 03.07.14 at 17:09, <olaf@xxxxxxxxx> wrote:
> > Saving and restoring a PVonHVM guest on a host which has the VMX
> > "Posted Interrupt Processing" feature enabled will fail because the
> > xen-platform-pci device does not receive interrupts anymore after
> > restore. The reason is that the IRQs are not maintained in APIC_IRR,
> > but in a separate PIR array. This info is lost during the save
> > operation.
> >
> > Syncing the PIR state into IRR during save, and restoring the state
> > later will fix 'xm save/restore' of a PVonHVM guest.
> >
> > Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>
> Guys, where are we with this? Afaict all simplification suggestions
> you provided so far yielded a non-working patch. Are you actively
> working on getting a working alternative, or can we get an ack on
> what Olaf submitted?

I hope Olaf can figure out why sync_irr_to_pir is actually required before
I can ack.


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